Very roughly the order is as follows
Fronts:-
X-gear red
Losi Green
X-gear yellow
Losi Blue
X-gear Orange
Losi Black
Rear:-
X-gear Red
Losi Yellow
X-gear Yellow (very close to the losi yellows but much more progressive feel on car)
Losi Pink
X-gear Orange
Losi Red
The difference between the two sets of springs is that the X-gear springs feel a lot more progressive on the car than the Losi springs, it's to do with the way they are wound to achieve each rate.
Hopefully I'll have a proper table up soon comparing all the common big bore springs properly on an industrial compressive test machine but until then the above will work as a reasonable guide.
Forget all the charts you find online, not one is totally right and they all differ from each other quite a bit.
Hope that helps
P.S. On the RB6 I tend to run X-gear yellow front / X-gear red rears (or Losi Pink if using an additional hole on the wishbone to the standard inside hole on flat arms)
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